Customer specific and individualised products, small batch sizes, as well as increasing product complexity set higher demands for assembly work. Augmented Assembly is a research project at VTT, where AR technology is applied to increase assembly efficiency. In augmenting assembly work, the assembly worker is guided by virtual objects of components and assembly tools, and visual assembly instructions. The worker sees the augmented view through light weight head mounted devices (e.g. data glasses),and sensors provide feedback from theperformed operations.